A NOVEL MEANS IS PROPOSED TO SAMPLE, COLLECT AND SELECTIVELYDETECT EXPLOSIVES VAPOR BY TAKING ADVANTAGE OF CERTAIN IONIZATION CHARACTERISTICS IN CONJUNCTION WITH EMPLOYING UNIQUE TANDEM ION MOBILITY SAMPLING, SEPARATION, AND DETECTION ARCHITECTURE. THE METHOD PROPOSED FOR DEVELOPMENTOFFERS SOME UNIQUE ADVANTAGES FOR COLLECTION AND DETECTION OF EXPLOSIVES VAPOR IN ATMOSPHERE AT VERY HIGH SAMPLE FLOW RATES WHILE PROCESSING LARGE SAMPLE VOLUMES IN REAL TIME.